Leaking exhaust flange

SOURCE: Small exhaust leaks. Are there

yes they have flange gaskets , be very careful when you loosen the nuts or you snap off the studs

SOURCE: 2003 chevy impala makes clicking noise/smoking thru exhaust

the clicking noise could be eiter a valve or piston. the smoke out of the exhaust means different things depending on the color and how much smoke. Check your air filter and make sure oil is not backing up into it. Also, it may be a good ideal to go ahead and change the oil even though you arent at 3000 miles, unless you just changed it. Change the PCV valve also, if itis clogged it will give you problems. Has the check engine light come on?

SOURCE: 2002, chevy impala 3.4 v6. wont pick up speed.

Had the same issue with my 2002 Impala. The solution was to replace a clogged or defective catalytic converter. There is a "Special Policy Adjustment # 05551 that will replace the converter for any owner, 2001 and 2002 3.4 or 3.8 engine, several GM models, up to 10 years old, and up to 120,000 miles. No charge if done by GM dealer and/orreimbursd if done by another mechanic or self.

SOURCE: I had a dual exhaust

best bet is to have the studs replaced, and install a new gasket

SOURCE: im trying to pass the smoke check on my 2000 chevy

its the O2 Sensor, depending on what bank its on, depends what one needs changed.. bank 1 or A is the sensor on the exhaust closes to the engine, and if its bank 2, or B its the sensor on the exhaust closest to the catalatic converter.... or it could say upstream or downstream, the upstream is the one closest to the engine, the downsream is the one by converter. hope this helps